I presume you can isolate the alarm from the mains?
More than likely there will be some kind of anti tamper mechanism built into the alarm system somewhere and it will sound (if the back up battery is still up to the job) but as soon as you disconnect the battery then the alarm will shut up too.
If you know where the battery is, and can plan ahead with the job, you should be able to change it with the minimum amount of fuss.
More than likely it'll be a 6 or 12 volt sealed lead acid battery that you can purchase from Maplin and the like. Mind you, the last time I bought one of these batteries I found Maplin had hiked their prices up so got it from Toolstation instead at half the price.
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Changing a burglar-alarm battery? new
Changing a burglar-alarm battery? new